WC颗粒在喷射成形高速钢复合材料中溶解—析出机理

Dissolving-precipitating Mechanism of WC Particle-reinforced High Speed Steel Composites Fabricated by Spray Forming

摘要: 用SEM/EDX研究了WC颗粒在用喷射成形工艺制备WC颗粒增强高速钢复合材料中的成分变化，重点分析WC颗粒与高温液态高速钢接触时发生的溶解—析出现象.并针对WC颗粒的成分变化，对比研究了传统硬质合金和钢结硬质合金中WC晶粒的成分变化，提出了WC颗粒在喷射成形高速钢复合材料中的溶解—析出机理.结果表明，WC颗粒增强高速钢复合材料中WC颗粒含有较多的合金元素，特别是Fe，这是由复式碳化物的析出特性所造成的.

Abstract: The behavior of WC particles of WC particle-reinforced M2 high speed steel composites（MMCs） made by spray formming with emphasis on the change of prtculate composition during the course of deposition was investigated. The dissolving-precipitating phenomenon of WC particles contacted with high-temperature liquid high speed steel was studied.The results showed that particulate composition of WC particles changed fundamentally during preparationof MMCs. In comparison with compositon of WC grain of traditional hard alloys and steel bending hard alloys, a dissolving-precipitationg mechanism interpreting the particulate changing characteristicewas proposed.